The magnetic flux is changed through a coil of resistance $10 \mathrm{ohm}$. As a result, an induced current is developed in it which varies with time as shown in figure. The magnitude of change in flux through the coil in weber is,

   

The magnetic field in the cylindrical region, shown in the figure, increases at a constant rate of $20 \mathrm{mT} {\mathrm{s}}^{-1}$. Each side of the square loop $ABCD$ has a length of $1 \mathrm{cm}$ and resistance of $4 \mathrm{\Omega }$. Find the current in the wire $AB$, if the switch $S$ is closed.

In the graph, variation of magnetic field with time $t$, applied perpendicular to the plane of the ring, is shown. Choose the correct statement.

A plane rectangular loop is placed in a magnetic field. The emf induced in the loop due to this field is ${\epsilon }_i$ whose maximum value is ${\epsilon }_{im}$. The loop was pulled out of the magnetic field at a variable velocity. Assume that $\overrightarrow{B}$ is uniform and constant. ${\epsilon }_i$ is plotted against time $t$ as shown in the graph. Which of the following is/are correct?

A triangular loop, as shown in the figure, is being pulled out at $t=0$ from a uniform magnetic field with a constant velocity $v.$ The total resistance of the loop is constant and is equal to $R$. Then, the variation of power produced in the loop with time will be,

A metallic square loop $ABCD$ is moving in its own plane, with velocity $v$, in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced:

The figure shows four wire loops with edge lengths which are either $L$ or $2L$. All four loops will move through a region of uniform magnetic field $\overrightarrow{B}$ (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the emf induced as they move through the field.

A square loop of side $5 \mathrm{cm}$ enters a magnetic field with speed $1 \mathrm{cm} {\mathrm{s}}^{-1}$.

If the front edge enters the magnetic field at $t=0$, which graph best depicts emf?